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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f263dbe7ba933ac6623534385c5f9683bb65908e450338725cf70cc51194093' 
  AND token = 'u+trdyHk+Xfj1cycE827dBfbNlO7yszy8B4gQc74sek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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