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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0371bff99473403772e2c577e4acb6322cbc8004bb12394a2bff259e1f51ab3c' 
  AND token = 'HrLrOOJzudAEUrjLZjNMv6CKzssYe7zmiaik8G+wuYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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