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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9adf9496527e932b865dd67330235eaa033998d8c359ff13abea5103f3b97da8' 
  AND token = 'Qvm4RyIo1QGBpnqNa8rCEFh4t1ET3AvGrRk9VKpxZxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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