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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb2c8c6a6bb48a7e7d44a94e7170a12dfbf81bc2e2ddbee637affe5c588850e' 
  AND token = '9PlOOyhjkeGKtcm8GQ5pvnr+87ESfS0BW3yhzMAmfIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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