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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15bde2e31e62b2523a21dff833cd56a18a383dd337a0a7103e001057c56f67bb' 
  AND token = '/keSX8JSKPinytB0XXjwE1MDPivm/7MRNzKDIBVSkZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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