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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ce2d086826d1986896350cf0efb44613f3a40d6b110f82a709cf5fc3b073451' 
  AND token = 'bmrOzcXM7zZJzDwjxFhSzVTnfFOAJ9iGrt+ZJc3TaCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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