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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fdc87f9ddbc86ce0e0255732fc4e75f2313006c3ca0258649c379cafe53dfd' 
  AND token = 'HYf+he6v9nTY9Pajh5oaRkmPXgANzLrYwugXI4CxHHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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