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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c9671ac1f855c7a6be0bcc69e5dc1e332643a5cd0a95a5c639ff6035d64ff0' 
  AND token = 'HEqpZw1/8VdP9mvSR1MEBYzHnHxrnjPEfa1MTO+TCzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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