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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4506d585ff4d8be70f85cadc65482ddfba2a7a4cd014381888385afd2875a04' 
  AND token = 'ItlkKldYYaaMJovIY6Nm06RkAMERpDyMMNb3f9bvqYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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