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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fa27d227466444aeb83bb45cc86d36010fed82eff4ac3254e46ce8cb56cda9' 
  AND token = '66ORYHzPPmq9fmY7v8qUGQycC2ghZ5aor8xE84CiwM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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