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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31604251d90f2b51fe2ed48ae5f5c23253997bd610ca7e9c5d5d533e9309b630' 
  AND token = 'VokXzTuc2Zj0274Bn48YuFpcZBp5X12EDwS2a2XBGLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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