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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15678edd70650626587c730acd35ed8a0505de2fd9174d534a43b13789f29c06' 
  AND token = '9peAyjRg10YG0M5GcfkATUvHEt1Tuy0Qk+/be+y5nf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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