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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2542fae9ec3c4b1ed322f88930c556493dccbc4fc23ad0a205e69f25e8cce8' 
  AND token = 'X/h64rd8rDXVSPrtx5wm/qx45wJP4g7/hfyQl+kf64o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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