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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e748ab8a8ed1c7cb8f2d1dbbe9e7eb83536e48fa3d74c305cb3631983ccc7d4' 
  AND token = 'ZRHzdgKEi6Wg0+gZ1dvMEpBJSh/d+NwnXMAaFoj5CJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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