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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8681a27e6f7be67fdd3d95d728b8377b5cb59bc36ad38722e657ae9a1d679d5a' 
  AND token = 'ONKlbNl5IcMHa980oJArvdgEeLS3WvEsSotU7tlPIXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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