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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc574bb6318761edcbae27836095a42d97f69f0739b4c36c69e05a327ea5dd68' 
  AND token = 'y2/oAXsdf1LROMe7lq1ODNajaaGT7R6KOgjFkpZ5lTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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