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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f781b636c1d34cd6c904b974ea9f0fc9c896117033d6a8800583b19a6f43a3' 
  AND token = 'FToL2+pMpOsW8635DyxS3U3DHw/tN9/K3SaXD54mNAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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