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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564f5e8daabb941d95623d39efc4e2eff4e54c73ca49e764fd219744b83ac94a' 
  AND token = 'aWes6iJXG3FbahfLpPm1A1PVqQFPNyi7LAdPED4G1hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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