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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d84348fa43dcd90866d43d7b352c17702c77909aa427a4da4b8b22a0acedc7' 
  AND token = '2JOwlm3t6l7DcmmK7rJSpRfRtACqlcKpnPP7yPhf59g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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