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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7b6c3ed4c833a22859807e798b710af7babebc0e46a96d48a6ae5976676493' 
  AND token = 'A5v4k5NkuSjIaz6LY1DN12xnLSWfY/VI1nregjA+L+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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