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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63853d6ea96d8d86209d62c12eb6f5816cf9ff16e9c56c6bc1386d50a3ae50a0' 
  AND token = 'fg3FP3QThv7YFOVznNDMV0z4+ZYHIwnAGewlV+nsrEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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