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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad955d243326c12db40e5d9ae56fe36357c8e95e8939a8bc15f167bd5ef1c032' 
  AND token = 'F+1iCKZsoLdQLPTYEeksORCcC52nQ3wXFYc6ogSXCKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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