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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61532f35f9cb15dc0cd6b0cfa2357c7a007e74d4ad3dfde3d6c6ca0e484489a' 
  AND token = 'NydsvcEWLmoa0tCg7blsD747INCX3a0mXHu7jUZTb3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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