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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93ea691aaf459fe20f4209fa1c179e35d31c82c4a3d4fb2976d8ec679931ed7' 
  AND token = '8rp5akJYPvT47R9e10o6dSeIwJFwzENEZLArrrfIuvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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