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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc930a3415496957a67d10a9666b28d709077889d5b9380c0309647e0d2bf9e' 
  AND token = '6Fn3ow9yKk6GPz33KDdch1sPZsE65ZE+opJkQ+dDyFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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