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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1bde3d6155ac9497def848008f0bad2e7814a465f495b83b72caacaa1b149f' 
  AND token = 'mYWWs/Py21ok6LI3mDSeYxbX6hM1BafU1R0ejbNbrsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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