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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0e9e1a6cf70c40af0e7b08766eaa3c8197fa6759420b1cbbc90c4dd7ceb016' 
  AND token = 'c84P3uiSCGE3kWA0LBME6MzfjgD6BtLmT3hVYjcVPew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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