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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc447e0143795974b089b4dfc05de06d4107fdf566ac68ca3a6fbcc15dcab2c8' 
  AND token = 'Y3gpvO2qV0OeX/V0kcUfUcXijSTICO9uLKR5Gz95OGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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