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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '125d47b4e65ba70bb17a336bfc6732df7646021e643d7fbea9df8d0ba5e7509e' 
  AND token = '0+nUXzVDdIqcvd/nD1Qr/ttft4nYw03Y/60M6omPlvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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