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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a53a7ea0a86ee715bae513cea1ee8f98b0e27bc0cedf339f9f015b309cba786' 
  AND token = '58gmpJgh5GeWl6NopGJafzctMOlhghs6d1nZLkAeMpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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