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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae02b72d61aa814f28c91de075f0a3e23916117a5855da36760a5acb71768e4b' 
  AND token = 'euTUQ8fTsvECpGgevtp/o5waHaIeu3ZK2Wg4jrIAR6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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