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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbec9aa7f6f23a3454c4255cc3100456c7c610b277fae0657482ad9ff52c8f7d' 
  AND token = 'HPYpRW+RbY7KnG6ByukUV2y1kOCNfFgxxoyVyhcWPRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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