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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8557af1b8aa5f1292809a9c1a8ffbc5848629edabc1e3da7441a6d0729698ac0' 
  AND token = 'IkyzlwgQQ9THKIA4eVC4oV+O9MsYiW4fkYvbbCFvuh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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