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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ac3f99c8733714a23564e76397c40eaa39e06af2e55c1aa917d0dd9b4e9bbd' 
  AND token = 'N86bipHq/I0WRXKFrXHhgS6JfTgDCoQ4OWKfV8MePBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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