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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de23d74cefbbd3c5e8cdcda50e53a0090bfc69771f188ae6724c72111953ab66' 
  AND token = 'yZSHS/r1SCWA33hKU5ahvvB9uenWLp+DeKTkV4e7r88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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