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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9738063a9792822d0fcd28544fdd0d42283b089cf089a9d937949e560803e0dd' 
  AND token = 'v+s6DyJx3Jwjez3XiN82Qivlz48wozxKgh6ZhECC6C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}