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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97add73335e80732cf1fe91db0179676a32ede9384d624f38ff716b8fb33e6a' 
  AND token = 'KONqjzsw+0D9GS2cxYogMGEnQNrhfbYWS1MXi6lOlVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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