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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dd244a7fedd94cb86cdc6fcdd74551235e61964f6f3644c99c6c88d421a9b02' 
  AND token = '92P1K1V4T+MR+c1xYuhfVeUt7I9/ueaQ4WE9w/UOH5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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