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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c3d8d644bc8d7ebe6ec07d1ab787743a23eac49ac7bcdbdfeaff9cb8166fd99' 
  AND token = 'BE9g1CaXG9qhi1IzqcETQ3I6TzwVQdaYhIIiUvjDHK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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