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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f457748c341b33063f7d42999a1984f394bb5c45adbdf818c3f0dabab361b1d4' 
  AND token = '5piyt83H+nQwR38vpX6HFZ9/FWY22g3d9LlgSzYuAIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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