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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e068c1ecdab4deba5abe74632c62507af67552189c6064e184bb5a44aba92dc' 
  AND token = 'r5Ajbh7MPgRbvtXUhnLS3hsT6FWww47ly8dZtYxP2jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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