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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4778598e1086dd434834131433b24b187882a4bf7b6d056506aa7579d2f88057' 
  AND token = '14F0x/tp+1yWbC4zwJuMUPN2uAg99Ix4xXWSU6AfkXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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