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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c8e76f0242d3c2f3edce4401fc0819c2a7e739ec54d9d55e60b1ff62e64028' 
  AND token = 'kBTJj3rOw/hE/clOlLzexQ8pohvQbEsTsd3GVOpuEq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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