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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b4b8a50a02bc9f30bb9485c1e52aae27c47f9f31ae035d35ab5b92eb07b61e' 
  AND token = 'UFxrNxEISsB6dwb61VvbEM27MRX2X8cr0Q6U3MWu4Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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