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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a36288acbc4cc4ef7ffa17896da94c85536babcead84a1834f7ba7053ce7d63' 
  AND token = '8eG7MSOXeJDN98qKYE4QFn3O1brvnw/Cg50WCXTyC+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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