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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae7de7cc7d253dc19d9e7e5e3c9d868dc1d885ce837dda7cbf5ad4967ca9eba' 
  AND token = 'Iu2hdRbaG5UcpTxSLtb9X3cyF+45Nvi5ppbte2IUjsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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