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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0f0bce5d3c01ef43257b35a2fe7cb05bdbd143a2286836cfe7befc1b54e6d1' 
  AND token = 'Cxzbi6VQ+ig37xIqu4GfYZQLGfgav4AllT7gvdc5HZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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