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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95540c80864c7d870836842dd3d91a396ee93c3edf145d171ec91a9c56257868' 
  AND token = 'h7fe90ummaxUDpPcOruZJ03Dxoc8srta3P+pTKt4RL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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