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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f7b3d60b8a72ee19fabe7ad67f92d7061c3e90155015dd46604a5e39abe9e1' 
  AND token = 'GRziUU54nL37rtCzoGgdK1Yi+eWIeWsg2qnf3gu33gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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