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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72cadacc32a04ea372170596ad206a839ca5c491d34b6944a878aff3a6eaab9c' 
  AND token = 'zn0+NZ2iZO9GRrB5J6folyYCBU6GUsDy/QiiIZRyom4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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