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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '111d3b09cfb25db03f150970a1a63c18c72521b0c2618e4f807cc6109fbdc1bd' 
  AND token = 'Cvfa456hY0+ZDTHgVsyFFhRbwU9NZiSy10lO8KK1iZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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