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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed5a5848c9a4b79c395373a788f9d19bfe4212b26b251e883449a3bf26a5509' 
  AND token = 'tcZN4T8dW27l69JVi6YWb+XS07oCADs4E/EtzqoU2u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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