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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59f5f0530f126dc2aa97094771c897315f799135d33c7de868de3798e7857cd' 
  AND token = '+foxsIfeYga1zVESO9LAy/U23kwGrO6ZNsqQ42q0DfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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