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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954776bb52c11bd8260c39d311f7538ec3efb5012adb828d11f9dfbbddce9828' 
  AND token = 'fCaA09drSBH/m5MP5lWm5zqog48hjptdH+ZHZNii4tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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