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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167124065b93b9163be87a6ec2f4e98940d99c0c6aa746b72dde34727bcd0598' 
  AND token = '3d7jG58vgq5UTav6AI0Z1nkQM5Ph8kPWvrqiMs8C+TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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