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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25aa63ef3baafd4135d5abd2d6e115ea9b5be9db5635a5e3343f2fb93c4cc6f' 
  AND token = 'oHLkru5zDNbT9OpBY5b9MCLm5JG76ZRicVbVj90YnEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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