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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1a3ef3226c670961aa0383ecac397953c3d526cb1663f51ce90400f1914384' 
  AND token = 'F7Gnsu4+6E/SQpn3wH7UCMyG/00JPacqF7QGm83zv4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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