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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2b9de605eda3dca9cc9f076246ecd1aed20db69a2d3ec78d99ebdd926d518f' 
  AND token = 'UZdZfxSscwQydjCG1UpYcvz5o2HA/VOtF2ovPPp7sNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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