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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5ac4fd8f86af76bf34b4a8e0cb76831916f8234ae52e5a4116ee721d3ebff2' 
  AND token = 'Pii4DoGz4NlISYIyqOfdIvsUJIn2qhudFSkLgE0xTCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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