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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6003cee9a2ca3c32c6b88e2322f0f98f564e2221797fc23b9df364afade0537e' 
  AND token = 'UTR6Lbb7o5lMIxLM20DgZo4HhAScq/DOr+JX0Fdq1Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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