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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd774d41bb99aaf3fab05c8482afcf2612fad9fdab1359139226919bc82a76085' 
  AND token = 'v+66z/TK5DmudgpkEOHua+oSJWdjc27IR9CazXhoEy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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