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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d67886b279340b06c83583135800966cc25def1e67c1b62395dabf01ba374b3' 
  AND token = 'kqpeSt3d2ea8ATCLrZENUePhybRKA1yCDo6Urtt4QlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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