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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59697f82d86dcefe9e3ae1594d4d5ebd6dda82aa3e43101a9a1abdbf14c6d778' 
  AND token = '3tIEe0Ehcld/ahhPI3z/ZiBI+43L7ZqSnMJX4TcQbN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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