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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3270825af5a70161c493022d607ec3977a8290c93620da05a52a9e38bdfbe423' 
  AND token = '7m5XRSRU266VcyYMJahlAp46GzBADsBMq03CR/KL5fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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