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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2efb30603ebb3ac9b276f08eb10f71ab2b318a85ae81b9403ca82570b42b1e36' 
  AND token = 'PmQX2ziBDqBEhh50Slo9beFtxiOVwl9o4ea0OuUNMdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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