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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2e30a6f349a40d483057cde74ba8886df485b5bc51903927b16e6b5c7b1050' 
  AND token = 'dEnSciNgK/xWoIHFSL7bwTh9U3T0Lp0mAaxQyXKYLtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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