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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a759aa6618618c7206ab5f9b709976e1fb9764444fc339e001553bd140f39b' 
  AND token = 'WDMIxrnAUdImn5/dT9kDQvYhdA4nBsDPAtbds60kMYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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